646425583 has 2 divisors, whose sum is σ = 646425584. Its totient is φ = 646425582.

The previous prime is 646425569. The next prime is 646425641. The reversal of 646425583 is 385524646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646425583 - 2⁹ = 646425071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646425523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323212791 + 323212792.

It is an arithmetic number, because the mean of its divisors is an integer number (323212792).

Almost surely, 2^646425583 is an apocalyptic number.

646425583 is a deficient number, since it is larger than the sum of its proper divisors (1).

646425583 is an equidigital number, since it uses as much as digits as its factorization.

646425583 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 691200, while the sum is 43.

The square root of 646425583 is about 25424.9008454310. The cubic root of 646425583 is about 864.6483397967.

It can be divided in two parts, 64642 and 5583, that added together give a square (70225 = 265²).

The spelling of 646425583 in words is "six hundred forty-six million, four hundred twenty-five thousand, five hundred eighty-three".